is 2 1871449 - 1
has 563363 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDA9B53B2104571F2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.877568.6567%500000150000000.10155.0823%15.979070.2497%1.5930%
PrimeNet2570.010363.1579%90001600000.00143.0295%0.011664.2740%1.1161%
GPU722610.164165.5738%100001500000.00141.6899%0.165566.1555%0.5818%
Difference+6+15.7134+3.0829%+490000+14850000+0.1001+3.3924%+15.8134+4.0941%+4.0941%

Known prime factors (1 factor, 67.5 bits, 0.00360548% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18714492050668141410205075372167.47554788245402632
23 × 3 × 7 × 8293 × 39324793
2013-10-0182933932479321.1050.16920.3148

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-10T06:03:00markrtiny2750006000000---0.046--3.928%
2016-03-16T12:38:11alpertronManual testing5000001500000012---0.101--5.082%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-10T15:57:00Architects CubedManual testing260261--0.082--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.853--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.628 GHz-days
Estimated T-Level:24.554
DigitsB1CurvesCompleteFacMiss
2011000255 / 1002.5507.709%
2550000255 / 2800.91140.158%

New Calculation Method

Total ECM effort:19.628 GHz-days
Estimated T-Level:24.554
DigitsB1CompleteFacMiss
20110008.7200.016%
25500000.79045.374%
302500000.04995.229%
3510000000.00299.775%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000332.285
50000660000021516.79
50000675000070.552


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00slaurv4_computersDA9B53B2104571F20.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T11:25:45Oliver KruseGTX-0
205066814141020507537
0C7FD94182B445__no
2017-11-07T15:46:11ATHec2-1xf
205066814141020507537
0C7FD94182B445__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
102
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102
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104
105
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108
TF factor-bounds graph:
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258
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2100
Last modified: 2021-09-29T12:09:51+00:00